4. a+b+c=1 = b este de 2 mai mic decât a; c= a + b; c-b= 30.
![4 Abc1 B Este De 2 Mai Mic Decât A C A B Cb 30 class=](https://ro-static.z-dn.net/files/db2/6b1be7f3388c1282482778b0ff0bfe5a.jpg)
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